Uniform pressure hand stamp



Aug. 25, 1959 H. BECKER UNIFORM PRESSURE HAND STAMP 3 Sheets-Sheet 1Filed April 14, 1958 am kN CE aw y m V y \M 5 Q, a V a Q N\nilIIHIIHIHHHHHWWHY!! s- 25; 1959 H. BECKER 2,900,902 7 UNIFORM PRESSURE,7 HAND STAMP Filed April 14, 1958 3 Sheets-Sheet 2 Mew/2y 5ECZINVENTOR. v 52 48 WTTOQ/VEV Aug. 25, 1959 H. BECKER UNIFORM- PRESSUREHAND STAMP 3 Sheets-Sheet 3 Filed April 14, 1958 HEN? Y 556858 INVENTOR.

07 7 OQ/VET V United States UNIFORM PRESSURE HAND STAMP Henry Becker,Los Angeles, Calif.

Application April 14, 1958, Serial No. 728,290

10 Claims. (Cl. 101-368) This invention relates to hand printing stampsand particularly to stamps in which the ink materials or substances usedfor printing are incorporated in the stamp itself.

In hand stamps in which the ink materials are incorporated, thuseliminating the use of ink pads for contacting the stamp, it has beenfound desirable to control the pressure of impression of the stamp onthe material being stamped. The stamp itself may be of the type claimedin US. Patent No. 2,777,824, of January 15, 1957, and usable for a greatmany impressions with only the ink materials incorporated within thestamp. It has been found that such a hand stamp will produce variousdegrees or densities of impressions, depending on the manipulation ofthe stamp. The present invention will provide a uniform impression atall times. The invention utilizes a case in which the stamp isresiliently held above the material to be stamped and has includedtherein a pressure control of the impression so that with use, the stampwill always provide the same degree or density of impression during itslife.

Also, the invention prevents bleeding of the ink materials from thestamp, since the stamp can never contact any material except at the timeof use. This feature also prevents smearing and protects the stamp fromdust and dirt. t t p The principal object of the invention, therefore,is to facilitate the stamping of materials with a hand stamp.

Another object of the invention is to provide an impression hand stampwith variable impression control.

A further object of the invention is to provide an improved hand. stampin which the ink materials are incorporated and which will provide auniform impression during the life of the stamp.

A still further object of the invention is an improved hand stamp whichprotects the stamp itself as well as prevents objects from contactingthe stamp.

A better understanding of this invention may be had from the followingdetailed description when read in connection with the accompanyingdrawings, in which:

Fig. 1 is a perspective view of a hand stamp embodying the invention.

Fig. 2 is a cross-sectional view of the hand stamp shown in Fig. 1.

Fig. 3 is a cross-sectional view showingthe stamp of Figs. 1 and 2 inimpression position.

Fig. 4 is a cross-sectional view taken along the line 44 of Fig. 2.

Fig. 5 is a cross-sectional view taken along the line 5-5 of Fig. 2.

Fig. 6 is a perspective detail view of the cam embodied in the stampshown in Fig. 1.

Fig. 7 is a cross-sectional view of a modification of the impressioncontrol shown in the stamp of Fig. 1.

Fig. 8 is a cross-sectional view taken along the line 88 of Fig. 7.

Fig. 9 is a perspective view of the pressure control unit shown in Figs.7 and 8.

Fig. 10 is a cross-sectional View of another modification of thepressure control unit of the stamp shown in Fig. 1.

Fig. 11 is another modification of the pressure control unit of thestamp shown in Fig. 1; and

Fig. 12 is a cross-sectional view of the pressure control unit shown inFig. 11. 1

Referring, now, to the drawings in which the same reference numeralsidentify the same elements, a triangular shaped casing shown generallyat 5 has curved end sections 6 and curved side sections 7. Dependingfrom the upper edges of end section 6 are parallel ribs 9 and 10, to thebottom edges of which is attached a plate 11 having openings 12 and 13therein. Through the openings 12 and 13 are two pins 15 and 16,respectively, which have one end of each attached to a stamp backingplate 18', to which is attached a stamp .19 of the type disclosed in theabovementioned patent.

Surrounding the pins 15 and 16 are cylindrical sections 22 and 23 of apressure plate 24. The lower ends of the sections 22 and 23 also passthrough holes 12 and 13 in the plate 11 so that pressure on plate 24will move V the backing plate 18 and stamp 19 downwardly as shown inFig. 3. To control the impression of the stamp 19 on the material to bestamped, a cam shown generally at 26 in Fig. 6 is mounted on a stud 27of the plate 11. This cam has a degree section 29 and a hub section 30.The lower surface of the cam (upper surface in Fig. 6) has serrations32, while the rim of the cam unit is knurled as shown at 33. The cam isalso provided with a 180 degree groove 34 in which is inserted a pin 35mounted on the plate 11. This pin in the groove 34 limits the rotationof the cam unit 26 to 180 degrees. A groove 36 in the plate 11 hasserrations corresponding to serrations 32 to hold the unit 26 in anyadjusted position.

To limit the movement of the pressure plate 24, a projection 37 ismounted on the inner surface thereof, the beveled end of which isadapted to contact the edge of cam 29. The pressure plate is depressedagainst the tension of a spring 38, having one end on the stud 30 of thecam unit 26 and the other end on a stud 39 on the inner surface of theplate 24. Thus, when the stamp 19 is new and fully impregnated with inkmaterial, the cam unit 26 is adjusted to provide a certain contactpressure between the stamp and thematerial to be stamped. This isobtained by rotating the cam unit 26, a portion of which extends througha slot 43 of wall 41 of the casing 5 as shown in Fig. 1. As the inkmaterial within the stamp is gradually depleted, the cam unit 26 isadjusted to provide a greater pressure of the stamp on the materialbeing stamped.

In Figs. 1 to 6, therefore, a certain type of pressure impressioncontrol is illustrated. In Figs. 7, 8, and 9, another type of pressureimpression control is illustrated, this modification using the samecasing 5 as shown in Figs. 1 to 6, inclusive. In this secondmodification, a tapered slide unit shown generally at 45 in Fig. 9 isused, this unit having a tapered body 46 and two rows of serratedgrooves 47 and a handle 48. In this unit, a backing plate 50 with itsstamp 51 abuts the lower surface of the casing plate 52, this platehaving two rows of serrations 54 to correspond with serrations 47 tolock the slide wedge unit 45 in any adjusted position. The pressureplate 56 has an inner stud 57 on which is a spring 58, the other end ofthe spring abutting the upper surface of the unit 45. When the pressureplate 56 is depressed against the tension of the spring 58, it islimited by an inner stud 60 adapted to abut the tapered edge 61 of theslide wedge unit 45. The handle 48 extends externally of the casing sothat it is accessible for adjustment of the wedge unit 45.

Another modification of the pressure impression control is shown in Fig.10, wherein the stamp backing plate 63 with its stamp 64 abuts the lowersurface of the casing plate 65. In this modification, the plate 65 has astud 66 thereon on which is mounted a spring 67, the other end of thespring being mounted on a stud 68 of the pressure plate 69 having anopening 70 therein. In the opening 70 is the head of a screw 71, theother end of which may be variably adjusted with respect to the upperend of the stud 66. Thus, the depression of the pressure plate 60 andthe movement of the stamp 64 are controlled by the position of the endof the screw 71 with respect to the other end of the stud 66.

A further modification of the pressure impression control is shown inFigs. 11 and 12, wherein a pressure plate 75 has an inner stud 76 onwhich is mounted a spring 77, the other end of which surrounds a stud 78of a plate 79 of the casing. The stamp backing plate 81 has a stamp 82attached thereto as in the other modifications. In this modification,the backing plate 81 and stamp 82 are offset to accommodate an ovate cam85 which is adjustable by hand knob 86. The position of the cam 85 withrespect to the end of the side 88 of the pressure plate 75 controls thepressure of the stamp 82 against the material being stamped. As shown inFig. 12, the cam 85 and hand knob 86 are mounted on the same shaft 90,while the side of the cam 85 has projections therefrom as shown at 91 tobe accommodated in a groove 92 to hold the cam in any adjusted position.

Thus, the above type of hand stamp mounted in the general type of easingshown at in Fig. 1 may have the impression of the stamp thereofcontrolled by either a rotary cam unit 26, a slide wedge 45, anadjustable screw 71, or a rotary ovate cam 85. In each instance,however, the same result is obtained, namely, that the pressure may beadjusted during the life of the stamp to provide the same degree ofimpression at all. times.

I claim:

1. A hand stamp comprising a casing having a portion adapted to contactmaterial to be stamped, a fixed plate within said casing, a movablepressure plate adapted to be moved toward and away from said fixedplate, an impression stamp mounted within said casing and movable bysaid movable pressure plate, resilient means for maintaining said stampin a predetermined position within said casing, an element extendingfrom said movable pressure plate, a second element relatively fixed withrespect to said fixed plate and extending toward said first-mentionedelement, and means for adjusting the distance between said elements tocontrol the pressure of said stamp on said material to be stamped whensaid movable pressure plate moves said stamp to said material.

2. A hand stamp in accordance with claim 1 in which said second elementis a rotary cam mounted on said fixed plate and said last-mentionedmeans is a portion of said cam extending externally of said casing foradjustment thereof.

3. A hand stamp in accordance with claim 1 in which said second elementis a wedge slidable along said fixed plate and said last-mentioned meansis a handle on said 4 wedge extending outside said casing for adjustmentthereof.

4. A hand stamp in accordance with claim 1 in which said first-mentionedelement is a screw in said pressure plate and adjustable with respect tosaid second element.

5. A hand stamp in accordance with claim 1 in which said second elementis a rotary cam on said casing and 3 said last-mentioned means is a knobfor rotating said cam.

6. A hand stamp comprising a tapered rectangular casing having a portionadapted to contact material to be stamped, a fixed plate within saidcasing, a movable pressure plate having a portion within said casing andadapted to be moved toward and away from saidfixed plate, and animpression stamp mounted on extensions of said pressure plate passingthrough openings in said fixed plate and adapted to be moved by movementof said pressure plate, resilient means interposed between said fixedplate and said pressure plate for maintaining said stamp within saidcasing, an element extending from said movable pressure plate, a secondelement relatively fixed with respect to said fixed plate and extendingtoward said firstmentioned element, and means for adjusting the distancebetween said elements to control the pressure of said stamp on saidmaterialto be stamped when said movable pressure plate moves said stampto said material.

7. A hand stamp in accordance with claim 6 in which said second elementis a circular cam mounted on said fixed plate, said first-mentionedelement being adapted to contact said cam, said last-mentioned meansbeing a portion of said cam extending externally of said casing.

8. A hand stamp in accordance with claim 6 in which said second elementis a wedge mounted on said fixed plate, said wedge being slidable alongsaid fixed plate, said last-mentioned means being a handle on said wedgeextending externally of said casing.

9. A hand stamp in accordance with claim 6 in which said first-mentionedelement is a screw adjustable in saidpressure plate, and said secondelement is a projec tion on said fixed plate contactable by the end ofsaid screw.

10. A hand stamp in accordance with claim 6 in which said second elementis a rotary cam mounted on the inner side of saidcasing, and saidlast-mentioned means is a knob for rotating said cam.

References Cited in the file of this patent UNITED STATES PATENTS136,458 Rountree Mar. 4, 1873 191,623 Tilton June 5, 1877 232,145 PotterSept. 14, 1880 346,690 Scotford Aug. 3, 1886 1,142,240 Dodson June 8,1915 1,183,547 Folger et a1 May 16, 1916 2,777,824 Leeds Jan. 15, 1957

